<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        p {
            color: rgba(255, 0, 0, 0.5);
        }
    </style>
</head>
<body>
    <p>这是 p 标签</p>
    <p>111</p>
    <p>222</p>

</body>
</html>